Diebold Nixdorf Software Engineer Interview Questions and Answers

Polymorphism is the ability of an object to take on many forms. Constructors and destructors are special methods in classes.

• Polymorphism allows objects to be treated as instances of their own class or as instances of their parent class.

• Constructors are used to initialize objects when they are created. Destructors are used to clean up after an object when it is destroyed.

• Classes are templates for creating objects. They ...read more

Encapsulation is the process of hiding implementation details and exposing only the necessary information to the user.

• Encapsulation is achieved through access modifiers like public, private, and protected.

• It helps in achieving data abstraction and information hiding.

• Encapsulation provides better control over the data and prevents unauthorized access.

• Example: A class with private variables and public methods to access t...read more

Remove duplicates in linked lists

• Traverse the linked list and keep track of visited nodes using a hash table

• If a node is already visited, remove it from the linked list

• Time complexity: O(n), Space complexity: O(n)

Mergesort is a divide-and-conquer algorithm that sorts an array by dividing it into two halves, sorting each half, and merging them.

• Divide the array into two halves

• Sort each half recursively

• Merge the two sorted halves

• Repeat until the entire array is sorted

• Example: ['apple', 'banana', 'cherry', 'date'] -> ['apple', 'banana', 'cherry', 'date'] -> ['apple', 'banana'], ['cherry', 'date'] -> ['apple'], ['banana'], ['cherry'...read more

Check if a string is palindrome or not

• Reverse the string and compare with original

• Compare characters from start and end of string

• Ignore spaces and punctuation marks while comparing

GATE is not my preferred choice as I am more interested in software development than research.

• I am more interested in practical application of software development than theoretical research

• I believe my skills and interests align better with software engineering roles

• I have researched and found that software engineering roles do not require a GATE qualification

I prefer open-source technologies and have more experience with them.

• I have more experience with open-source technologies like Linux and Python.

• I believe in the benefits of open-source software for collaboration and innovation.

• I am not opposed to using MS technologies if they are the best fit for the project.

• However, I prefer to work with technologies that align with my values and experience.

Diebold offers challenging work and opportunities for growth in the software engineering field.

• Diebold has a strong reputation in the industry

• The company offers a diverse range of projects and technologies to work on

• There are opportunities for career growth and development

• The work is challenging and rewarding

• Diebold values innovation and creativity in its employees